There's a difference between your boss not caring about you (does any boss really care?) and your boss actively disliking you enough to call you a loser when they expect to gain nothing from it.
In the former case, disrespect is a side effect of laziness, while in the latter it is the whole point.
My point is that it's disrespect of the same kind as your boss forgetting your name when you've been working for them for ten years, not as being called a loser.
There's a difference between your boss not caring about you (does any boss really care?) and your boss actively disliking you enough to call you a loser when they expect to gain nothing from it.
In the former case, disrespect is a side effect of laziness, while in the latter it is the whole point.