armchair critic:
(plural: ‘armchair critics‘; pronunciation: the first and the last letter ‘c’ in “critic” is said with a ‘k’ sound as in “king”)
a person who judges or comments (says something good or bad about) the work of other people and gives advice or criticises the work without having any deep knowledge or experiencing of the practical difficulties,
Suranjit Sen, armchair TV critic
Most armchair critics criticise what other people do but they never do or show how to do those things in a better way.
The other critics, such as the film critics, book critics, etc., need some qualification, knowledge and experience while they criticise or comment on others’ works, but an armchair critic does not need any — he/she can just say anything that comes to the mind, and so, most often, nobody cares what he/she says!
