Yes I would say that statistic has meaning. Stepping back a bit, I think you're confused about what a statistic is, in particular what the forum male to female ratio statistic means. You're arguing from a strawman, the statistic doesn't say what you think it is trying to say, all statistics are are data from the specific environment from which it is gathered, and though not perfect or definitive, it is tangible data.
Stop. Just stop right there. I'm not even reading the rest of what you said.
Look... data is only useful if it's meaningful. That's why there's a whole science devoted to polling and using statistics correctly. The data you've cited is not at all meaningful- i.e., we do not know the sample size, the number of respondents that choose not to answer the question at all (my guess: the majority), etc., nor whether they're being honest or not.
So, your 'statistic' is
junk. It's like walking into a store, seeing that they have 10 apples and 1 orange, and claiming that all stores have a 10:1 ratio of apples to oranges. We can't use it as even a starting-place for a meaningful conversation, basically.