I was going by the following definition of respect in the context of this thread (quoth dictionary.com):
In other words, I read the title as "are shy guys seen as people with lesser abilities and qualities? Are they seen as worth less than others?"esteem for or a sense of the worth or excellence of a person, a personal quality or ability, or something considered as a manifestation of a personal quality or ability
The answer is yes, because shy/modest people don't tend to show off their worth, excellence (if applicable), abilities or qualities as much as others, so it appears that these things are weaker.
I think that once someone gets to know such a person they will respect them just the same, but it'll take longer to realise because the person is not shouting their worth from the rooftops - so such people are respected less overall throughout their lives than those who are instantly respected the moment someone meets them.
So if the question is "do they get hurt more, physically and mentally than others" - that's probably a yes too. Shy/modest people are less likely to stand up for themselves, and there are plenty of folk who would happily exploit this and walk over them.