Line 1: "as my english isn't perfect, I will express myself in french ... [ unsure ] "
(I think its this) " If one (ie: someone) says that I don't know you, and furthermore, if your opinion of me changes as a result, then frankly, I have nothing to [foutre?], and your opinion is not that of everyone. That is the first thing.
"My second point is that I have known you for at long time (2 years in UT) and have watched you evolve (ie: watch you/your clan grow) ... don't forget that I created *-)V(-* and you were still (pretty) cool at that time...I [passerai?] the clans for which I played, even against you, yes, against you, and at one time I often played on the publics [ie: public servers] with CHAPPY, who is himself pretty cool"
Basically, he is saying that one of your players, and he "isn't afraid to name names" - and this player is DESPISE, came on to some public server under an alias (ie: not using his clan name) and then when he got a "Godlike," he briefly changed to his real (ie: sixth) name, took a screenshot, and then left, no doubt happy with himself. And Virus then asks how you can consider your clan to be FUN and FAIR to play against if you pull stunts like that. [ie: he is basically saying that despise, as a DIV1 player, jumped onto a server full of easy meat newbs, racked up a "Godlike" kill spree, changed to his real name, then took a screenshot.]
He then goes on to say that "I never saw anything like that from you before you made it into division 1"
basically, he is saying some of your players have become arrogant, and have forgotten that they were once "newbies" too, and that they go to servers full of newbies to get easy kills so they can post screenshots of "record times" etc for various levels.
He goes on to say that this is just his personal opinion, and that he has nothing against you [not clear from context if he means clan 6th, or someone in particular], but he has notice how you [again, could be the clan or someone in particular] have changed, and that you [again, same thing] have fallen in his estimation as a result. (i.e. - he doesn't respect you so much any more)