Someone I know and see regularly on (group setting, we are not technically friends but frequent exchange of polite conversations) is a very well-to-do woman, living in a very nice house, expensive fashions and takes holidays abroad regularly (I mean like 5 times a year at least!). It's really doing my head in and for the sake of my mental wellness I muted/hid her profiles on social media. I get the usual advice that I shouldn't be envious, social media is not real and only displays curated version of her life bla bla... but everytime I see her living her best life I get pang of jealousy and puts me in a rotten mood all day. Now I'm not alone in this, someone else within the group also feels the same and we do often talk smack about her in private. I don't know if there are more others around feels the same but I suspect.
Yesterday out of curiosity I checked on her profile and she completed her climb to Mera Peak in Nepal which as she wrote one of her biggest dream, the post got so many responses (but I do notice only 1 or two people we mutually befriend reacted). When she returns to the country, AIBU if I don't congratulate her and pretend that I don't know about her milestone travel? If she brings that up my plan is to respond very minimally like "uhm ok" as I just can't fake it. I'm not happy for her.