Size doesn't matter. I think flags are meant to be as big and as small as you want(providing you can still see the details). I think it's more important whether there is a consensus in the community of what flag should be used for what, otherwise you will have confusion and indecision.

I don't think a flag needs to be revolutionary or counter-culture, as long as it has a specific purpose to the user that is still relevant. Same with the symbols. They are less in your face, but they would be equally vestigial if there was no use for them. Which you pick comes down to personal aesthetic preference. Whether your flags and/or symbols get co-opted by another movement and used by trenders or corporations who change their underlying meaning and goals, is somewhat more important. In that sense, Gilbert Baker is right about flags being used as colourful, iconic propaganda to claim "territory". It applies to pride flags like National flags.

The original Gilbert Baker flag is nice. Beats the 6 stripe imo.

Personally, I wouldn't refrain from using a flag/symbol/etc. just because something like this happens. If it's as much of a fad as some say, then it will last like the dust in the air after a stampede. Just try not to get trampled in the meantime.