You're right, I was uncharitable, and for that I'm sorry.
But respectfully, the "charitable advice" people give that non-sinful things are sinful and of the devil has unnecessarily driven away many people from the faith. Projecting one's own scrupulosity onto others causes scandal.
I have a coworker who's a recovered alcoholic. He knows alcohol is something he can't handle, and hasn't had a drop in years. But when our team went out for drinks after work, he came along with us and ordered a coke. He didn't start telling us we were endangering our health by drinking or preaching about the evils of alcohol, because he knows the problem isn't with alcohol, it's with him and his inability to handle it safely.
Of course we need to have discernment in all things, since we all have our own weaknesses. But a lot of people have been driven away from God by a well-meaning but scrupulous person telling them that they're endangering their souls by playing D&D, or watching perfectly clean anime, or listening to certain genres of music, or reading comic books or manga, or having tattoos or the wrong length of hair, or hobbies typically associated with the opposite gender, or yes, being told that wearing pants is immodest or unfeminine when they were fifteen. Laying unnecessary burdens on people trying to live the faith can make them break and flee from it, especially when those people are young and impressionable.
I once had a person reblog one of my posts, in tears, because they had been told throughout their childhood that something as innocent as loving musical theater "too much" meant they were making an idol of it, and had to give up their favorite hobby. It nearly broke their faith. Seeing my post about how that kind of reasoning is dumb (liking something a lot is not the same as prioritizing it over God or your fellow man) had apparently helped them, but how much better would it have been had they never had to go through that unnecessary crisis of faith in the first place? How many people have been driven away from a loving God by pharisees who tie up heavy burdens to put on people's shoulders?
I'm sorry for being rude and flippant to people who think these things are sins, but respectfully: they are wrong, they should keep their scrupulosity to themselves, and discernment on neutral matters that are only morally harmful to specific people who can't handle them (like alcohol) should remain between oneself and one's confessor, not be exported to the outside world of people who can safely handle these things.
