Friends and friendship are often overestimated. What I mean is that there are many cases when it's better to be friendless than being with a friend who's not a real friend or who's just someone who you can't deal with right. For example, there are those friends who will think that you should do everything for them, including crimes. This is their understanding of the "real friend" and if you're not a moron or a complete freak, then you know that it should be the end of this dangerous friendship. Or, imagine that: your friend is a vegan or a stoner (a marijuana user) and he/she wants you to join it (to become another vegan or another stoner), otherwise "What friend you are?!" and if you're not okay with this, obviously, it's a big problem for your friendship. And what about all those who are asking for more than they give? Like you're helping him all night long with some homework or spending hours to resolve some of his problems and he even refuses to do you a 5 minute long favor (like helping you with a little computer problem or calling somebody instead of you)?
I think that incels (and other people) who complain too much about being friendless don't know how difficult it is to find a real problemless friendship. The difference with being in a love relationship is that when you have a girlfriend, usually, you'll get some things for sure: passion, hugs, kisses and maybe more and it's nearly granted no matter how good is she, what are her personal qualities and so on. But with a friend nothing is granted, nothing is sure, you never know what to expect because it's less predictable.