Allow me to re-word your sentence:

"We absolutely could have domesticated raptors."

My group without any possible room for disagreement from a sain man, disagrees with you the outsider.

My group (the royal 'We' giving a sense of universal acceptance but the sentence above clearly disagrees creating an in/out group mentality and the illusion that you are the odd one out, placing me in the out group) without any possible room for disagreement from a sain man, disagrees with you the outsider (this last bit is interesting because it is not a sentence The layman would agree with, wether true or not, ergo the entire point was to place me as an outsider not to make a fact).

That is an adversarial comment looking to discredit me.

A more proper way to say that would be something like:

You could domesticate a velociraptor.

Or if you truly believe it to be so

We do actually have evidence that it is possible to domesticate velociraptors.

As far as it being an opinion you are technically correct, your intentions might not have been to communicate aggression, however your opinion in this case doesn't fall in the equation. you are performing the act of communication, the information that I received is what matters, otherwise you have failed that goal.