I guess I am “uncool” since I have a rear-mount kickstand on my bike. I love it, and I check to make sure its tight periodically. I have never had it loosen up yet. I go for practical, and we have several bikes - I got tired of leaning my bike against the wall and more than once it got knocked over and suffered some light scratches as a result. Like everything else, it is a matter of personal taste, and it should not matter what anyone else thinks - it is YOUR bike. And I am also a heavier rider, so the tiny amount of weight of that kickstand is a non-issue. I also ride with full panniers on a hybrid, make pretty speeds (16 - 18 mph avg.). If you are racing or endurance riding, then yes, weight would matter, so it is a matter of personal preference. I am also “uncool” because I do not own a cycling jersey or matching outfit, kept the reflectors on my wheels, and use regular sneakers instead of cycling shoes. Just call me a Fredwina, but the main thing is I enjoy riding my bike immensely and regularly. The kickstand is a handy thing to have on her.
“No Bird Soars Too High If He Soars With His Own Wings” ~ William Blake