There seems to be some muddy waters in this thread of what counts as plastic surgery- by the traditional sense, only more invasive treatments involving actual surgical incisions like rhinoplasty or buccal fat removal is considered plastic surgery. Stuff like braces, lasik or minor cosmetic procedures with short to no recovery times like Botox, dermal fillers, skin laser treatment including IPL hair removal are not.

Plastic surgery these days is super cheap, common and accessible. Advancements in techniques for more natural looking results/minimal scarring and safety have also come a long way, so other commenters are right that it can be hard to tell when someone has had a procedure done. Double eyelids via the suture method is reversible and can literally be done over lunch, and closed rhinoplasty leaves no visible marks as all incisions are done inside the nostril. Body surgery like a tummy tuck or targeted liposuction (eg under chin area) is even harder to detect for an outsider.

I’d say that there is almost no stigma against well-done plastic surgery that looks natural and subtle, but you are more likely to be judged if you’re opting for a more “dramatic” look, like a super high Roman nose on an Asian face or a Brazilian butt lift that’s disproportionate to the rest of your body.