While I agree with your sentiment, there is a difference between not understanding and actively disparaging. The former is fine - there’s plenty of stuff I don’t understand, and I just don’t comment on it because I have no business doing so. Where I take objection is when the lack of understanding transforms into bigotry and disparaging remarks.
By all means be ignorant (and I don’t mean that in a derogatory manner - we are all ignorant about various things), but don’t let your ignorance manifest into negativity.
I’m really glad to see this. My husband and I game together a lot so we will still buy individual copies of a lot of games. Theres some games though that I’d like to try but never will because I won’t buy them, and his library is basically never available when I want it to be. Happy that we can now share some of those really weird one off games!