But I think those visiting such websites can distinguish between examples and the rest of the message.
Remember that a lot of the learners have a basic level and it may be their first time using a forum like this.
If I were a new visitor and I read, for example ...
I don't know how to use these because it looks a lot like this and I also have a problem knowing when to use them
... I would have trouble knowing what it meant. Equally, if a learner posted that, the native speakers and teachers would have a problem knowing exactly what the question is. It's much easier for everyone if it reads:
I don't know how to use "these" because it sounds a lot like "this", and I also have a problem knowing when to use "them".