If you think all men who struggle dating are fascists
No idea where you got that. But I do see a lot of fascists who alienate women as friends and partners, then grow resentful when they don't receive "respect" they feel they deserve.
This can quickly escalate into stalking and further violence against family or ex-partners, unless other people intervene.
The idea that a violent misogynist shouldn't be argued with or deterred, because their sense of superiority is more important than anyone else's safety is what's brought us to the modern fascist moment.
Is someone with social anxiety, therefore struggles dating, a fascist?
If "social anxiety" means lashing out at women in order to force them to comply with your demands?
Absolutely.