I really surprised XEL is dumped harder than other coins. Why those dumpers bought XEL to sell it at the current bottom?

Thanks for selling so cheap

Probably because they believe it will go down even more, and they want to get out earlier.
This is selling the bottom - usually those guys exprience permanent losses and default quickly on any market (stocks, currency, crypto, ...doesn't matter).
However, XEL's bottom (in dollar terms) was ca. 0.11, so there's some space to touch it again
