North Dorset MP Simon Hoare has defended a local councillor 'spat at' by a member of the public when she volunteered to direct beach traffic.
Dorset councillor Laura Miller said some people were "unwilling to accept" that roads were closed for public safety around beauty spot Durdle Door.
Mr Hoare tweeted: "She does not deserve abuse still less to be spat upon.
"Some people are, to coin an old Labour MP phrase: lower than vermin."
The Conservative MP also criticised photos taken early on Thursday morning of rubbish on Bournemouth Beach.
He said: "I wonder how many of these unthinking selfish people would contact their MPs about marine pollution or moan to their Council if their street was filthy with rubbish or possibly have children who’ve done projects on effects of plastics in our seas?"