Being liberal isn’t a bad thing, I am more so left leaning then right leaning, I consider myself central left!
Well liberalism and leftism are not the same. For example, Stalin and Mao would be left but not at all liberal.
Anyways, liberalism is a bad thing if you look at things from an Islamic viewpoint.
No one can objectively study Quran and Sunnah, take that as their starting point and arrive at liberalism.
You have classical liberalism, today's liberalism and the forms in between such as 1960's liberalism.
Classical liberalism- a movement opposing Christian religious monarchies. called for secularism and liberal democracy.
Democracy and secularism are not in line with Islam.
1960's liberalism- advocating for "free love" (ie zina). Associated with opposition to the war in Vietnam, which I think was a correct position. I think they were right on that issue but the whole package of 1960's liberalism definitely has some things not in line with Islam.
Today's liberalism- basically some sort of homosexual movement. It's basically about promoting homosexuality/transgenderism and then for a moment they paused and became about promoting coronavirus measures. But the whole movement these days is basically centered around homoism. They literally promote war with Russia on the basis that Russia isn't pro-homosexuality enough for them. They were threatening to sanction Nigeria for not being pro-homo. They promote drag shows and sex change procedures for little kids.