I only tailgate in left lane .
Tailgating in any lane is stupid and dangerous, even in the left lane.
Aside from that, it REALLY bothers me when I'm going as fast as I possibly can in the left lane and I have someone right on me.
Take the not uncommon hypothetical where I pull out to pass a semi going 65 only to get stuck behind one going 67. In that situation, what am I supposed to do? Unless I do something really stupid like pass in the shoulder, I'm not getting around the semi in front of me. I have another one to my right. I'm "boxed in" and it's going to be a minute or two before the one in front of me is in the right lane.
In that situation, what good will someone tailgating me do? I'm sure not going to go any faster, nor can I get over. I'm still within the "slower traffic keep right" law as I'm moving faster than the right lane, and I'm still within the "Keep right except to pass" law as I'm actively passing the vehicle on my right.
Yes, as soon as I can do so I'll either step on the gas or get out of the way(or both) but in the interim the only thing you being a few feet from my bumper does is make things super unsafe if something happened that I had to make an emergency maneuver in that lane.