It depends on how you say it, what you say, and to whom, and the circumstances.
I'm going to be devil's advocate(kinda) but also I'm not sure if you're referring to something that happened and I also think that every story has 2 sides and people telling their side aren't necessarily giving the whole story. Where exactly were you accused of being the villain, is this something that actually happened or is it just something to do with how you feel?
Also I don't think that just one outlier calling you a villain would really justify the way things are presented, so it could be disingenuous to suggest that you're the villain for saying these things when in fact that isn't the case. It's hard to say since there are no examples of what actually happened. Also I'm going to double down on the title at least being disingenuous because what you said would be tantamount to encouraging ctb and that is extremely frowned upon here, that is actually a bad thing, something that both mods and community enforce. So saying that it's worse than that seems untruthful at best.
Anyway, so saying something like "I hope you find happiness in life" - and I don't know whether you said that or not but you gave it as an example, but it could be taken as a rejection of someone's decision to ctb. The decision of someone to ctb is part of someone's personal autonomy and denying that is offensive to them. It would be similar if someone was talking about wanting to die and they did not want to be talked out of it, then saying something similar could be considered inconsiderate. As someone else posted, not everybody wants help or specific kinds of help either. Ignoring somebody's wishes is what I would consider to be rude.
People here also really hate platitudes, some people mean well but they are not good at expressing themselves, so if someone is expressing themselves with good intentions but in a way that is upsetting people then it is really for the best of everybody that they stop, take a step back, and reconsider best how they can express themselves in a way that doesn't upset people instead. Instead of blaming the other person/people for getting upset.
As an example, saying something like that in someone's ctb thread could potentially rub someone up the wrong way because you're essentially implying that they shouldn't ctb. A lot of people expressly write into their ctb OP that they do not want to be deterred from the decision. So writing "I hope you find happiness in life" after somebody had already expressed that, in a goodbye thread, could be considered inconsiderate of the OP's feelings and decision up that point. No ctb threads are easy, it's a hard decision enough for many people.
So how you say it, what you actually said, to whom and the circumstances do matter imo.