For any particular tribe you'll see members of that tribe use dishonest tactics to try to convince the other side.

I find this the most distasteful when science, logic, consensus, etc. is on a particular tribe's side. Member of the tribe don't need to use underhanded schemes to try to argue their side. They are actively undermining their tribe by using dishonesty to attempt to strengthen their position.

While it's certainly true that there are some people on the Internet who both agree with the overwhelming scientific consensus on global warming and make bad arguments,

a) that does not imply that the position those arguments defend is incorrect, and

b) for the science denialists, bad arguments are all they have.

Let me rephrase that for you:

"My tribe is correct. It's the other one that's bad."

"Both sides are just being tribal, there's no real right answer" is one of the more common methods used to dismiss the very real differences between the two sides and attempt to prevent progress from being made.

"progress" meaning "my tribe wins."

"Progress," meaning "the things the "tribe" that labels itself as "progressive" wants."

So, yeah, you're not being particularly clever by observing that.