Preaching "Science" to people you don't know from Adam is certainly priggish.
I am the source of my expressed opinions and, imho, this ain't no scientific venue, Einstein.
If one denies climate change for “scientific skepticism”,
That's slaying a strawman of your own construction. Instead, try lending strangers more benefit of the doubt at least until exposed as seriously deluded and/or ignorant. In this case, the man described all climate scientists with alternative findings as "skeptics." Nothing wrong with that. From skeptoid.com:
The true meaning of the word skepticism has nothing to do with doubt, disbelief, or negativity. Skepticism is the process of applying reason and critical thinking to determine validity. It's the process of finding a supported conclusion, not the justification of a preconceived conclusion.
Indeed, skeptics apply much needed pressure to keep researchers questioning and honest rather than cocky and complacent.
This is an argument from authority, which is somewhat acceptable,
No, appeal to/from authority is never "okay" else it wouldn't be a logical fallacy. But I didn't appeal to/from any single authority. I appealed to numbers (obviously) which is a fallacy of a different color, lol.