Is the left lane really the "fast lane"?

I’m new to driving and I thought the posted speed limit is the same for both lanes. Even though I understand that the left lane is supposed to be used for passing.

I was reading this article about a lady who got a ticket for going 2 miles slower than the speed limit while in the left lane.

People in the comments are saying she deserved the ticket for going too slow in the “fast lane” and that its common knowledge that people go faster in the left lane and its about time someone got a ticket for “lollygagging”.

They also said people who go slow in the left lane cause more accidents than the speeders.

I was expecting that people would be supportive of the woman for thinking the ticket is ridiculous, but they’re actually supportive of speeding.

Who’s right?