Telling an incel he can get a date by showering and getting a haircut is like telling a woman to stand up and then you realize she's a midget.
Do you think that "unattractive" people aren't worthy of love?
Of course not, but even unattractive people can get dates if they clean themselves up.
So what exactly are you implying here? You shouldn't say that people don't deserve love just because of who they are, and instead should be showing these people support so that they can turn their lives around. All you need to do is a few small kind gestures and you could potentially help people who you deem unattractive into bettering themselves, instead of joking about them.