Even the most conservative estimates consistently place it around 10-12% (and this is supported by decades of sociological research from around the world). And that’s the people who openly admit it. The actual number is likely far higher (speculation is 15-25%, but it’s only speculation), especially when you consider “incidental attraction“, which accounts for those who are only “sometimes attracted“ to the same sex. Aka Bi/demisexuals.
The real mistake is trying to reduce sexuality to a number or a statistic. That said, your estimation is way below the mark.
Now what you’re commenting on is the inherent laziness of people nowadays, and how they don’t really bother to express themselves very clearly anymore. it’s a very real problem that leads to a lot of miscommunications, especially online when vocal tone is absent from interpersonal interactions.
I blame our failing education system for that, alongside the forced brevity of online communications.
In casual conversation, when referring to an artist, an actor, comedian, etc., when someone says “I don’t like X“, it typically refers to their performance/art, not to them personally.
For example, I never really liked Monet. I certainly never knew the guy, so I can’t comment on him personally, so what I really mean is that I never really liked his art.
Yes, it’s vague and deserves clarification, but there it is. English is a messy language.