> Speakers with English as a mother tongue on seeing an unfamiliar word will ask how to pronounce it rather than making educated guesses at how to say it because any rule is often broken, and we learn not to trust our guesses. In fact someone who is well read but mispronounces words (intuited from spelling) is often laughed at.

I disagree - I guess at pronunciations frequently (as a native speaker), and it is a useful skill to be able to do so. For a learner, it may be _helpful_ to ask how to pronounce (especially to avoid reinforcing misconceptions), but I don't think it's a universal rule of English that people ask how to pronounce words. I also find that many of the mispronunciations are regional variations or misconceptions (e.g. hearing Worchester as "War-chester" instead of "Wus-ter", or Yorkshire as "York-shy-er" instead of "York-sha"), so even if you ask, you might not learn the "true"/regionally appropriate pronunciation.

I've also never come across the later -- I know plenty of well-read people (native and non-native) who have made mistakes in pronunciation (such as a friend who read "parser" as "pa-ray-ser"; native speaker) and they are simply corrected, not laughed at.