Do you think this is True Some People will be Rude to Someone There Attractive but they wont admit they like them

SURE, some do--but this isn't necessarily the case. Some people are rude because they're rude fucks.

tbh for the most part, you should take denial at face value bc:
#1. if someone says no, you respect that and move on
#2. if they're just messing with your head then do you really want to be involved with that kind of passive-aggressive person

yes. its called Pigtail Syndrome
or ala anime: tsundere