As another account said the very same thing as you did. Word by word. I'll just copy paste my answer for you.

If someone says over and over that the Bitcoin described in the design paper on bitcoin.org is traded under ticker BTC, 'that' might really hurt someone as well.

Best thing to do is to differentiate between both coins and the idea that is "Bitcoin" presented in the paper. We do this easiest by calling one Bitcoin Cash - and one Bitcoin SL, or "Core" because it is defined by a single official client.

In private you can still call either coin that you prefer simply "Bitcoin", as your peers will likely know which one you mean.