Guys, how do girls act towards attractive guys & unattractive guys in normal settings?

Excluding parties & nightclubs

I'm asking because I've been currently trying to get my GED through my local community college & I've been around a lot of guys & gals my age & from what I've person experienced

a lot of the girls would act either very hostile, bitchy, standoffish towards me while with other guys & gals there very "friendly" & open

Guys, how do girls act towards attractive guys & unattractive guys in normal settings?
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