The chair straddler is a dominant, yet cowardly sitting position, because for one, the seating position requires one to spread their legs wide open exposing the genitals, and two, because symbolically it is as if they were holding a shield against their chest. Crotch displays are typical for dominant people, especially men. Women can also sometimes display authority in this fashion but if done improperly it appears like a sexual invitation rather than a dominance display. Figuratively, chair straddlers are spears throwers or arrows flingers as they toss words at others from behind their barricade. It might not always be the intention of the staddler to come across this way, so it is our duty as good body language readers, to reserve judgment until we catalog enough cues in clusters. For every rule there are always exceptions. The point here though, is that other people will judge us poorly if we become the person that straddles chairs. Certain dominant body language is acceptable, but this isn’t one of them.
If you find yourself (over) exposed to a straddler, there are a few ways to disarm him from his shield. The first is to change your seating location so that he no longer faces you directly, exposing his genitals. You can also stand up altogether and even move behind him making his posture totally ineffective. By moving behind him, his back will become exposed and unprotected, causing him to tense up. The height differences will also force him to try to remain more erect and upright, so to speak, causing him to feel uncomfortable and annoyed in short order. A proficient straddler will then turn his chair (and his member) to face you, and just like a real-life chess game the pieces move strategically. This brings about the third technique, which is to overcrowd his personal space by standing over him, being careful to continuing the conversation. If all these techniques fail, and in most cases they won’t, you can always call him out on his attitudes and body language. Like calling anyone out for any reason, this is risky and can easily backfire alienate him altogether. In extreme situations, you might see no risk at all since all you stand to lose is an arrogant acquaintance.