You don't know what most of our fans have been through in the last 10 years.
Well, supporting your club/team in the bad moments (playing in Serie B for your case) is what makes you a real fan. If you support your club only in the good moments then you're nothing more than a gloryhunter.
I had the opportunity to talk with a lot of Juve fans and most of them were arrogant and under-estimating Barcelona, only talking about divers/cheaters/uefalona and all this bullshit. When I went to many juve forums to also read the general opinion , I find the same reactions ; arrogance and lack of respect towards FCB.
Not saying that you're all the same, because we also have a lot of disrespectful fans, but "what your fans have been through in the last 10 years" isn't an excuse.
I never liked your club nor Italian football in general (apart from AC Milan), I have a very bad image of Italy after what happened against France in 2006. However, I respect your club and your team, and will definitely congratulate you on Saturday if you deservedly win the game.