It's certainly better than "anti-vaxxer" which labels them and buckets them as crazy and makes them dig their heels in further. If the goal is to convince people to get vaccinated, belittling them is not the right approach.
It's very different from calling you Strawman-er, which would be making unfounded assumptions about your general argumentation style and would pre-judge future statements by you.
When people don't do this, they aren't advocating against vaccination.
My understanding of the strawman fallacy is that the strawman is inaccurate. None is expressed here, simply labeling a phenomenon.
> which would be making unfounded assumptions about your general argumentation style and would pre-judge future statements by you.
After decades of internet discussion, such charity from people holding opposing viewpoints appears to be rare even when explicitly and rigorously adopted.
But "anti-vaxxer" has two meanings which are conveniently confused in current usage.
1. Someone against all vaccines 2. Someone against the current COVID vaccines