You forgot to mention your own comment on the question:

Trivia, also they are easy to read. – cde Feb 5 at 8:50

This seems to suggest that you felt the question is off-topic ("trivia" is one of the custom close reasons). However, within minutes of making this comment you also answered the question.

Answering a question you believe to be off-topic is generally considered a dodgy thing to do. It's not against site rules - you're allowed to do it (note that the mod didn't take any mod action on your answer; he only commented and possibly voted) - but some people may think less of you for it. If you think a question is off-topic, you should be voting to close or even delete it, rather than making it harder to get rid of by posting an answer. Doing the latter can look like an attempted rep-grab.

I believe this is what Ankit was trying to express in his comment:

I though[t] this question appear[ed] off topic to you, [so why did you answer it?]

The comment could perhaps have been phrased in a more constructive and less snarky way. But given that you're an experienced user and already know the site norms, there's no particular need to explain to you that it's seen as a bad thing to answer an off-topic question. (Says the guy who's just explained it to you, of course - but then, here on meta you did ask.)

You forgot to mention your own comment on the question:

Trivia, also they are easy to read. – cde Feb 5 at 8:50

This seems to suggest that you felt the question is off-topic ("trivia" is one of the custom close reasons). However, within minutes of making this comment you also answered the question.

Answering a question you believe to be off-topic is generally considered a dodgy thing to do. It's not against site rules - you're allowed to do it (note that the mod didn't take any mod action on your answer; he only commented and possibly voted) - but some people may think less of you for it. If you think a question is off-topic, you should be voting to close or even delete it, rather than making it harder to get rid of by posting an answer. Doing the latter can look like an attempted rep-grab.

I believe this is what Ankit was trying to express in his comment:

I though[t] this question appear[ed] off topic to you, [so why did you answer it?]

The comment could perhaps have been phrased in a more constructive and less snarky way. But given that you're an experienced user and already know the site norms, there's no particular need to explain to you that it's seen as a bad thing to answer an off-topic question. (Says the guy who's just explained it to you, of course - but then, here on meta you did ask.)