Im afraid Lipton tea is unpleasant, because it’s so weak. The reason Brits are fussy about tea is because we drink it with milk. This requires a very robust flavour in your tea; overwhelmingly we prefer strong malty flavours. This type of tea, drunk without milk is very strong and bitter. Some like that but it’s rare for people to drink tea black.
Pretty much anywhere else in the world tea is more likely to be drunk black, usually with sugar and lemon. The blend is therefore altered to compliment this.
You can imagine however how using a teabag with a lighter flavour would be pretty insipid when you tried to add milk. This is why a tea aficionado will carry their own.
Separate from this is not understanding tea must be made with boiling water and brewed for 5 minutes to develop the flavour. Combine a weak blend with hot (not boiling) water, then add cold milk and be prepared for a truly lukewarm, unpleasant mouthful.