You don't need to be an expert to ask questions and discuss, but you do need to be an expert in the field to claim that other person is clearly so wrong that you would "feel sorry for him", which is a cheap condescending rhetoric.
I personally feel it's a bit unfair you would be condescending towards him given that you own information is based on few biased articles, I know you said you "read various sources to get clear picture" but given you are a British citizen I doubt you devout much time to understand current Russian affairs and as such I would presume your outlook on situation is quite misinformed, hence I am trying to make a point, if you are not an expert on the field or at least not well informed, then don't sound like a pompous you know what.