Speak to them in private and let them know how you feel and let them know that you won't stand for it. Speak to their supervisors or Human Resources if that doesn't work.
Someone who speaks dramatically could be referred to as melodramatic or theatrical.
British
Outspoken?
Someone who speaks dramatically and impressively could be called a declaim or an orator.
You could call someone who speaks two languages but not well a "basic or intermediate speaker" in both languages.
A polyglot is someone who speaks multiple languages, often at least five or more.
A monolingual.
The common term for someone who speaks several languages is "multilingual."
A polydialectal speaker.
A bilingual person or a Franco-Anglophone.
A person who speaks more than one language is called a polyglot.
A person who speaks five languages is often referred to as a polyglot.