I think it mostly has to do with the fact the guys are pushing themselves too heavily on Frankie that bothers her, rather then them fighting over her. If they treated her less stalker like, she might even find the fighting thing cute.
And while it may be cliche, it's apart of our culture and I've seen this same thing in other shows as well. Like Teen Titans as I said before, as well as There's something about Mary, Cat Girl Nuku Nuku, and even in Sailor Moon.
I find it amusing and a form of flattery.
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