I feel like most people laugh at Penn State rather than hate on them- they haven't really done anything in the last 40 years to warrant the hate. No Natty's in the 90s, 2000s, 2010's, or 2020's to speak of. I think maybe one or two B1G titles since they joined in 1994. CFB Playoff been around for a decade and this is the first time they've ever made it and they only made it because it expanded to 12- not because they had an excellent resume and argument to make the top 4- just so happens it went to 12 and committee needed filler to get to 12. Does anyone even really take them seriously enough to hate them? Probably more indifference or pity there than hate imo.
I feel like the 5 most hated teams are probably 1. Notre Dame (and rightfully so), 2. Ohio State (fan base are complete nutjobs and they are always winning), 3. Alabama (fan base are also complete nutjobs and Saban had the gumps dominate the entire sport and suck all the air out the room the last 17 years), 4. Georgia (everybody gotta be sick of Kirby doing his best Saban impression and the Jawjaw gang winning damn near everything the last 4-5 years and of course of the high speed car chases/crashes), and 5. Michigan (dirty scoundrel cheaters)....probably in that order.
I feel like of the helmety teams Texas and USC are actually probably more liked by random run of the mill fans than the others. Nebraska might be most well liked now actually just because of the pity factor. Been a long sad 30 years for them Corn loving mouthbreathers.