Well, that's a somewhat broad question. I think that among many people, sex surgeries are not socially accepted. Sure, most media outlets that are at least politically moderate will not criticize it, and there is a somewhat strong stigma of political correctness that keeps many people from criticizing the procedure. Sex reassignment is a very popular topic and many people have gotten the chance to think about it and come to the conclusion that it can be helpul for people who are indeed the wrong biological sex. But go into a rural region like the southern US and it will probably be a lot less accepted.
The difference with LL is that it's not nearly as much in the public lamplight as sex reassignment. There is no public discourse on it. Most people don't know much about it and many have never heard of it. Then there are the popular news stories of Chinese women doing it because they find long legs aesthetically pleasing, and many people go "WTF, this is very extreme and long legs are not that important". But acceptance is an individual thing. I believe that if you are a reasonably short man doing LL, and explain to people your story and your struggle with height, and your honest reasons, many normal people will understand, and relate. And a lot of them would accept your decision.