I think this thread has come up a few times. In my opinion, the dislike for a club is not consistent but changes with a club's changing fortunes.
I have never liked Arsenal yet found this team under Wenger insufferable. This was exacerbated by the fact that I frequently visited France during his tenure and disliked how popular Arsenal were in the Hexagon at that time. I really hated the bespectacled knob who ran one of the Arsenal fan sites.
I have never liked Liverpool and find them insufferable. It pleases me whenever their fortunes wain or if they get humiliated by Man Utd. Just feel they are the one English team due their comeuppance and even more so than Man Utd. Other than that, i have to say I have never liked Spurs who I feel have a fan base that is seriously deluded over their reputation. The affinity towards Israel also makes Spurs a team I really dislike.
As far as Portsmouth are concerned, I see them as bitter rivals yet also have respect for them. Some of their fans are horrible and have a dreadful degree of misunderstanding. Despite this, for me they are not a team I could dismiss. There is so much heritage with Portsmouth and I do feel that they have a bigger and more passionate fan base. Having worked for a long while in the PO postcode area, I feel Saints fans seriously under-rate Portsmouth whilst , at the same time, few clubs have underperformed quite like Portsmouth over the last 50 years. Having seen what Portsmouth achieved under Redknapp, I am wary of what they could do if they got their act together. They are not irrelevant and would be bigger than Saints if they had more capable owners and a stadium that belonged to 21st century and not 19th. Not convinced they will ever fulfil their potential yet am conscious that a 'rectified 'Portsmouth would have the potential to dwarf Southampton. Just don't see it happening in the short term but I think the threat is there is they ever got their act together. In summary, I enjoy reading about their misfortunes whilst conscious that the potential is there to be the south's biggest club.
Not sure about the dislike for Bournemouth. I am always glad to see them do well unless playing Saints.
Whatever happened to the hatred towards Luton Town ? They were always the villains in the 1980s. Just think that Saints fans are more inclined to dislike former manager or players as opposed to clubs these days. Different in the times of plastic pitches !