Beardo and Harold are both good beatboxers, who clashed because of their contradicting personalities and different views on other contestants . The latter also has a hatred for one of Beardo's closest allies, Dawn, as Harold believes she is holding the team back. In Total Drama Amazonian Nightmare their rivalry is greatly shown, such as the arguments over the team's work ethic and teamwork.
In Total Drama Amazonian Nightmare both are on the Vontade and as a result of this, have a very strong interaction with each other early on. Harold thinks of Beardo as uncooperative and ignorant, whereas Beardo thinks Harold is bossy, stubborn, and very in-humble. Because of this, the two develop a strong hatred for each other. Their attempts to eliminate each other don't seem to work in either's favor for a while, until Harold manages to blindside Beardo in Survival Instinct. Despite their conflicts, the two have agreed on some things, but it is unknown whether or not this was propaganda to trust one another.
At the beginning of the episode, Harold and Beardo seem to get along fine. Beardo takes Harold's order to get the water with no interference. Later, though, they get into a controversy over the beatboxing skills of each other. Beardo tried to remain calm, but Harold went for it and criticzed Beardo. This is the start of the rivalry between each other.
At the beginning of the episode, Harold and Beardo seem strangely friendly, considering they just had a huge arguement. But, like the former episode, they have a conflict over there views on something. Harold was upset with Dawn and her vegetarian ways, as she didn't eat the food Harold worked hard on, while Beardo saw it as fine. This is the start of one of Beardo and Harold's most heated debates.
During this episode, Harold starts to take even more control of the team then ever before, much to Beardo's dismay. Beardo was already in a depression over his inner conflict of his sexuality, but do to Harold giving him a job he felt uncomfortable with, there hatred for one another became stronger then ever. Harold almost costed them the challenge with him taking all control and failing, but Harold got lucky as Fortaleza did even worse then he did, saving him from an elimination at a tribal council.
This is when the conflict gets bigger then ever. Harold starts to get stressed that Dawn is not treating him with respect, but Beardo sees Harold as being rude and persistently annoying. Dawn tries to stop the conflict, but by this point their hatred for each other is too strong to stop.