tsu and su are different. You might have trouble hearing them, (particularly if people are talking fast or when listening to something that is above your level), but that just means you need more listening practice.
You could try iKnow!で英語。ちょっとの努力で、大きな成果を。 - the "dictation" mode there requires you to listen to a sentence and write down what is being said.
Uhm...
They're different.
"tsu" has the "ts", as in "cats". (IPA /t͜sɯ/)
"su" has the "s", as in "sat". (IPA /sɯ/)
Maybe it's just me, but isn't this obvious?
The more practise you have, the less confusing it becomes.
Just a word by itself can be easy to confuse, especially if someone is not speaking clearly.
But in a sentence you're not likely to mix up tsuki and suki.
That's also definitely true and I probably wouldn't have gotten it wrong had she said like "tsuki o mimashita?" or "sake ga sukidesu ka?"
I would reply, heya tsuki o mimashita + sake ga sukidemokiraidemoarimasen.
Additionally, whoever repped me don't worry about it...I always get angry when people say, "isnt it obvious"? If the person is asking something it's apparent that they do not know it and to say it's obvious is kind of like slapping them in the face. The one thing I hate about being wrong is the after effect when people say "oh, wasnt it obvious?"
That's also definitely true and I probably wouldn't have gotten it wrong had she said like "tsuki o mimashita?" or "sake ga sukidesu ka?"
I would reply, heya tsuki o mimashita + sake ga sukidemokiraidemoarimasen.
Additionally, whoever repped me don't worry about it...I always get angry when people say, "isnt it obvious"? If the person is asking something it's apparent that they do not know it and to say it's obvious is kind of like slapping them in the face. The one thing I hate about being wrong is the after effect when people say "oh, wasnt it obvious?"