It’s a fairly common thing for Muay Thai practitioners to have a sense of superiority when it comes to other martial arts. There's a fair amount of reasoning behind this, due to Muay Thai’s practicality in the real world and how, nowadays, Muay Thai fighters usually beat other styles.
The downside to this mentality (aside from just being pretty lame and annoying) is that it makes a lot of people think that other martial arts, like Taekwondo, have nothing to offer.
This is nowhere near the case. Even if Taekwondo is not all well rounded and all-encompassing as Muay Thai, there are still a lot of things to learn from it, especially in its kicks.
(Side note: Why is Taekwondo considered a "traditional martial art" but Muay Thai isn’t? Muay Thai is older than Taekwondo and most Karate styles by literally every measurement! Rant over.)
We all know that the roundhouse kicks in Muay Thai...