Personally I dont go after people stats right off the bat. Its pointless.
However, if he acts in a dumb way and then proceeds to flame everyone and be a douche, I prefer to stick it to him.
Also, regarding divs:
Theyre great for winning. The only times ive seen divving be actually bad are in faildivs and in triple potato divs.
However, thats the issue: theyre great for winning. If you div a lot, you are going to perform as a divved player and not as a solo player. You are simply going to win more due to teamwork, ship composition, and guarantee of at least 2 good players on your flank per game compared to a solo game where the only constant is you.
I am not trying to say youre a bad player, but if the majority (say, 75-80%) of your games are divved and then you claim to be a good solo player, then I'm not going to take it as seriously as someone with the same WR but mostly solo.
An example that I have much experience with: CV divs. You bring a CV + 2 AA ships that also carry lots of damage and/or utility (Kidd, Kutuzov, DM, mino, BBs). Any flank the divmates are on is almost always an instant win on air control with little to no input from the divved CV. The only way for a solo opposing CV player to win (the air) would be to find a flank with lower AA and then decisively outplay the enemy CV, all the while the flank (s) with the divmates is a no-fly zone with smoke, radar, or both, causing the enemy CV to have minimal impact.
This creates a situation where while the CV div wins a lot, the requirements for doing so is lower than doing the same in a solo CV. Its quite depressing to be able to win a 1v1 vs the enemy CV and then lose because they guarantee 2 AA ships to stop you cold.
For this reason, I usually don't rate CV players unless I have had the chance to 1v1 them in battle. Unfortunately, a lot of the divved CVs I meet lose their bite once they leave the comfort of their divmates AA bubble...
And honestly, I don't blame them. You get complacent when playing with divs IMO and it kind of gets in the way of being a better player (I usually play for the win and to get better). MM also encourages this since ship stats are not factored in and div rules are too lax.
Just my two cents.