[headsoup]

It is. You're implying that the other commenter's post is invalid as 'blind opposition' because 'their side' of the argument behaves the same.

* Edit on below: On re-reading you're correct, you were categorising their comment. My apologies!

[tptacek]

No. Tu quoque is an appeal to hypocrisy. Pointing out that other concerns with big industry have been misleading, as with Seralini's apparently fraudulent glyphosate study, is an appeal to credibility.