This fails as both a hasty generalization fallacy and straw man fallacy.
Hasty generalization: what one persons, or a small group of persons, might say or do is not ‘representative’ of an entire class of persons, just as the individuals in the video are not ‘representative’ of ‘all liberals’ – assuming they’re ‘liberals’ to begin with.
Straw man: the OP contrives a lie about liberals in an effort to misrepresent their position, in this case the lie that liberals are ‘hostile’ to free speech, when in fact nothing could be further from the truth.
The OP then attacks the lie contrived (straw man) claiming ‘victory,’ but actually the thread premise is just a lie.