Okay i'll start with the purple prose because, well, it's been ten years and i have to recant some of it. I mean, the prose in these books did annoy me. I do not like it. I've just grown enough to recognize it's more "not for me" than "objectively bad" and i think the phrase purple prose pathologizes or vilifies a certain style of writing that's ultimately valid. Ineffective in my opinion, but I'm sure it has its perks.
What I would say on the topic instead (now) is to be mindful of the medium you're writing in. Having encountered that type of prose more, my working theory is it tends to irk me when the writer comes across as writing as if they're making a movie in their head. Which is not playing to the strengths of the medium you're in, and kind of comes across as if the writer wrote a book by default, because they didn't have the means to access a hollywood-level production, rather than out of a genuine love of the medium.
At least, that's how it feels to me.
It's not like describing visuals is inherently bad, but it's much more powerful if you can give the visuals meaning. Tell us how the visuals makes someone feel. Make the scene affect something. Sparkle in some theming! Don't make those curtains just be blue.
Toxic masculinity is a much broader topic, one that a single tumblr ask can't possibly begin to cover. But to bounce off your example: the issue is that "men talking about women's appearance in private" doesn't happen in a vacuum. Women are objectified in society, and it reinforces that notion when they're treated as literal objects to be discussed behind closed doors.
But that's not the part of it that I would really put into toxic masculinity. To me (as far as I understand as someone who has a very layperson understanding of it) the part of it that's toxic masculinity is how the act of discussing it with other men, or people perceived as such, behind closed doors, creates an environment in which one can either participate in it, or see themselves devalued. Speaking from experience as a queer person: there's nothing more terrifying than being forcibly dragged into that conversation, and having to decide how to navigate it without putting myself at risk. And I'm actually attracted to women, contrary to popular belief. It just so happens that my gender is complex and my attraction to women is more akin to a lesbian asking Agatha Harkness to put a curse on me, mommy. But interestingly, if I brought that to the table in boy talk, that would also get me ostracized. Because it's not just about talking about women's looks, it's about doing so in a prescriptive way, one that enforces a certain type of attractiveness above others (and that intersects with race, ability, etc) and that also enforces a certain power dynamic in the attraction of a man to a woman.
(Well, I say it's terrifying. It was as a teen. As an adult who has grown comfortable enough with his autism to make it everyone else's problems I just side eye and go blank until they stop)
But this doesn't affect only queer people, obviously. This same mechanism of social ostracism also affects any man, even a cis straight man, who would want to object to the treatment of women, or express a less conventional kind of attraction (like, say, the example I just cited, although I've yet to see a straight man say that about Agatha Harkness).
And that's...not easy to wrap your mind around! You kinda have to deconstruct your entire world view. It's not easy. The only reason someone like me might have an easier time of it is because I've had to do it to figure out who the hell I am in the first place.
This is why I don't think your point about treating all people equally works all that well. Maybe something may have gotten lost in translation, because it's not about giving someone preferential treatment. The thing is, objectification is harmful to everyone, not because you're feeling or expressing attraction (or lack thereof) but because of the implied power behind it. And that power, in the world we live in, is concentrated in the hands of privilege and wielded against the marginalized. So it's more that, in trying to redress social injustice, it's more urgent to call it out when wielded in that direction.
And just to be clear, as I hope was obvious in my little segue: you can still be horny without objectifying someone. It's about treating them with respect, as people with autonomy.
Anyway. Last thing I'll say is we live in an age where you have countless opportunities to find other perspectives, even if you're introverted and with friends who are mostly from a similar background. I am very much a shut in. That's what the internet is for.