Context matters: who is saying it and where they're saying it matters. I see the word used in my personal social life as well as professional; I can safely say it carries a very different tone when it's coming from the person who posted a pic/vid or the person responding to the pic/vid.. as opposed to calling someone a simp behind their back, or someone who's not involved calling someone a simp.
"Would you simp for me?" and similar lines have become a bit of a meme at this point, and doesn't sound so serious because it's been overused, especially if the audience you've attracted sees you meme often.
In my personal life, I say "I simp" or "simping hard" to compliment a friend whenever she posts a selfie and she does the same to me. So if a viewer says they're a simp for you, they're not seriously talking down on themselves, they're just memeing while complimenting you.. but it is an insult if someone else stepped in calling them a simp.
The context is different when it's someone posting on a models forum like this, asking for strategy info while referring to the viewers as "simps," out of sight from their core audience. I would be just as disgusted to see a model referring to their supporters as "simps" in models-only as I am seeing this random ""manager"" calling them that.
Obviously I'm not the law on this word, but I hope this take makes sense. The women who say it are above the OP imo.