Red Bull clears Hamilton's contentious move on Vettel at German GP
Hamilton, who was at the back of the field after suffering a puncture at the start of the race, came out of the pits with fresh tyres and passed reigning F1 champion Vettel, who was scrapping with eventual race-winner Fernando Alonso of Ferrari for the lead.
Vettel later called the Englishman 'stupid' and suggested his actions had cost him a chance at winning the race.
However, while Horner defended Vettel''s comments, he accepted that Hamilton was within his right to overtake him.
"Obviously, drivers'' emotions run high. It was an unusual situation because usually when you lap a car, it doesn''t come back past you. But Lewis was on fresh tyres," News.com.au quoted Horner, as saying.
"In Seb''s opinion, it affected his race and it did affect his race. But it''s within the rules and [Hamilton] did nothing wrong and arguably helped his team-mate," he added.