Was it antiscience to say covid originated in a lab in China?
YES, there was little evidence AND there still isn't conclusive evidence that it was. They just used it as a reason to be racist toward Asian (and it did provably increase hate crime toward Asian people).

Was it antiscience to say 2 weeks to flatten the curve was BS?
YES, if people would have actually isolated, we would have had far fewer cases shortly after.

Was it antiscience to say cloth masks were ineffective?
YES, they are still effective and far better than not wearing a mask at all.

Was it antiscience to question the long term efficacy/long term side effects (I'm combining 2 questions here) of a drug that was not studied for the long term?
YES, the vaccine was not given to people widespread until after thorough testing. It's fact that almost any vaccine side effect will occur within the first few weeks of it being administered. There was also information and testing about the efficacy before it was widely distributed.

People questioning this stuff were given the answers by scientists, specialists, people with knowledge, and they outright denied the truth of the data. It's one thing to question, it's another thing to yell questions into the void and pretend you don't hear the answers.