People who treat juniors and seniors differently

Have noticed over the course of time, one of the clearest marks that somebody might be an asshole:

1. In front of seniors: Extremely nice, subservient, "How are you doing", "How was your weekend hehehe", They'll aggressively try to match lunch times, so on and so forth

2. When only juniors are around (absence of a senior): Clearly moody, won't talk properly, might even be aggressive in their asks, miss greeting them when crossing paths, avoid them during lunches, generally low energy around juniors

We all know them, but it's an interesting way to gauge the people around you I feel. Anyone else noticed this/some version of this?