I think there are a few things in the same ballpark as worth discussing:
* ``, which strikes me more as "Heh." than "lol";
* ``, which feels like "haha" or "lol";
* ``, which IMO doesn't really have a parallel in written English, but is the equivalent of smiling or slightly giggling while you say the sentence outloud; and
* `[…]`, which feels like "hahaha[…]".
They all feel quite gender-neutral to me. Of course you don't seem as serious if you're laughing (with seeming the most serious of them all to me), but I don't really think that makes any of them feminine.
(This is honestly just my own impression of them, which could be wrong.)