Some users find dropdowns hard to use. Don't use a dropdown if:
users might need to select more than one option, use checkboxes instead
your question only has a few options, use radio buttons instead
you can ask your question in a way which reduces the number of options or if you can split the question into simpler questions with fewer options, where you can use radio buttons instead
Display an inline error when there's something wrong. For example, when a user tries to proceed without selecting an option and the question is mandatory.
You need to tell us what type of nuisance you're reporting