Literally, I have given you, in writing, what difefrence ther eis in menaing if you just swap 'R' and 'l'; so no, Thai people do not do that, as they are not analphabets, so they know how a wrod is written. That for many foreigners, the difference is not great enough to hear, and they are analphabets on top of it, does not paint a pretty picture, but it is what it is. For me, it would not be enough to seek excuses when wrong, but to master the difference between my incomplete knowledge and what was presented to me. Again, not doing that does not paint a pretty picture, but you must be happy in your own head... oh no, wait, you are not, according to your OP. Maybe the problem is that you lack in curiosity and you are too shallow to enjoy what is right in front of you.