I think that Loki and the Surfer have only met once or twice, and the second time was a crowd scene late in the Avengers-Defenders War when Loki was blind. The first time they met was in Silver Surfer #4, and the Surfer seemed to be jobbing to Loki. Loki is also lying like a rug, even lying about his dad. More than three pages of scans here, culminating in Loki backing off and delivering his sales pitch:
https://panels-of-interest.tumblr.co...er-surfer-1968
In answer to your question, the Surfer didn't seem intimidated by Loki.