>>50061082Depends on the language. Some languages make a big deal about what, as an outside, appear to be very minor differences in pronunciation. Other languages are more malleable, and you won't get your head chewed off for speaking in a local accent.
Consonants in English tend to be more definite, although the more rural you go the more slurred, nasal, or softened/sharpened they become, differing by community.
Particularly in Eastern countries, the especially differences between D/T (for Chinese), B/V (Chinese), C/G (Korean), F/P (North Koreans), V/W (Hindi/India), and R/L (Asians languages, especially Japanese) are frequently challenging for ESL students. Vowels are also often confused, especially when they're not emphasized. This seems to be a particularly big problem for Hindi speakers.