Thanks for spreading the word... it's a great way to help us, suggesting CC/C2 on other forums. However, you shouldn't be surprised to get responses like this. Construct isn't the right tool for everybody - sometimes for someone's particular case, a different tool may be a better fit. You're not going to be able to persuade every single person ever to use Construct.
Perhaps this user was looking for a tool that they could import an existing Game Maker project in to, because they did a lot of work on it. As far as they're concerned, it's possible other tools are compatible with Game Maker projects, but if not, they're not interested. You shouldn't get frustrated - although they weren't super clear, that's a reasonable position.
However, other forum lurkers may read the thread and try out Construct! I see in our site referrers we do actually get a lot of hits from forums where Construct is mentioned in passing like that - even if nobody directly replies - so it still works! Also, Google counts it as an extra mention on the internet, and possibly another inbound link to our site, which helps our page rank. So it's still great to mention us around - just don't be forceful, remain respectful and understanding of the tools people use - and keep spreading the word!