skinny is not a need

Why do people make being skinny a must do, i was in tennis for a while and i stopped playing bc it was. not fun anymore and i hear one thing from the most awful people " you should do tennis again you were so skinny back then" SHUT THE FUCK UP i have not got any bigger and i have been going to the gym as well how about you take you triple neck rolls and try a deit before you say i need to be skinny i am happy how i am right now and im not going to go back to a bad coach and sport just bc you think i was skinny when i was playing like girl what. But like its not been getting to me as much snymore bc i dont care but its not even about them wanting me to be heathy its about my looks like fuck off. im still underweight for my height anyway like 6'0 and only 152 i dont need nor want to be anymore skinnier