I'd say it's still an incel mindset either way

Edit to explain more - I feel it's evolved from the original meaning to also include misogynistic (and misandristic et al) behaviors based around the idea that someone owes you sexual consideration or favors for really any reason, and the backlash these people display when they don't get it.

Think of the scenario where a person comes on to someone, gets rejected, and says "I didn't like you anyway / you're not attractive anyway / fuck you anyway" as a form of retribution. That's incel to me and it can definitely manifest in "nice girls" type of cultures as well as the more classic "nice guy" archetype