People are free to support whoever they like as far as i'm concerned, be that Celtic, Man Utd or any Irish team. I support Celtic because they're the club i feel the closest affection to, it's been that way ever since i can remember and it's a tradition that's existed for decades of my family's generations.
Why should i have to change all that just because some guys on here let their inferiority complex get the better of them and take exception to who i support??
Celtic approximate that at least 5,000 of their 53,000 season ticket holders are based in Ireland, myself included, so at least it shows that the Irish 'supporters' do just that and make every effort to live up to the name by going to see the team. I've yet to meet a so-called supporter of any English team who bothers to travel to see the matches, too many define their 'support' as sitting watching the live match on SKY Sports every weekend!
These are the people you're wanna have a go at. Celtic have a genuine, long upstanding tradition of being greatly-supported in Ireland and that will never change, if anything it will only grow stronger.