I feel the person you responded to worded that poorly. I think it’d be more apt to say you’re not obliged to approach someone you find unattractive, and I’d agree. If your goal is romantic or sexual in nature and attraction is a requirement for you, approaching someone you aren’t attracted to is a waste of time. The key point here though, is that shouldn’t change your approach. It should just narrow down who you approach. Especially for someone introverted, I don’t fault them for wanting to optimize their approach strategy given their limited social battery.