Was Hazrat Ayesha [Allah be pleased with her] Hadees rejector?

1. Narrated Sahl bin Sad: Allah's Apostle said, "If at all there is bad omen, it is in the horse, the woman, and the house." (Sahih Bukahri,Book #62, Hadith #32).
Imam Ahmed reported in his Musnad 6/246:

Abu-Hassan reports that two people came to Aishah and said to her that Abu Hurayrah narrates that the Prophet used to say that bad luck is to be found only in women, horses and houses. At this Aishah replied: By the God who revealed the Qur’an to the Prophet! The Prophet never said this; what he did say was that the People of the Jahilliyyah hold this opinion.

The isnad of A’ishah’s hadith has been declared authentic by the hadith masters al-Hakim ( 2/479 ) and ad-Dhahabi. It has also been declared authentic by Shaykh Shu'ayb al-Arna'ut.

Note: In simple words - Hazrat Ayesha rejected that so-called-hadees because actually it was not hadees. She rejected because those were not words of Prophet even though Hazrat Abu Hurayrah understood so.

2.  Second instance of "Hadees rejection" is when she was told that dead is punished because of wailing of relatives. She rejected on the basis of Quran because words of narration contradicted with Quran. Moreover - she knew that Prophet had not said so. It is important to know that many sahaba were understanding the same thing until hazrat Ayesha made things clear.

Narrated `Abdullah bin 'Ubaidullah bin Abi Mulaika:

One of the daughters of `Uthman died at Mecca. We went to attend her funeral procession. Ibn `Umar  and Ibn `Abbas were also present. I sat in between them (or said, I sat beside one of them. Then a man came and sat beside me.) `Abdullah bin `Umar said to `Amr bin `Uthman, "Will you not prohibit  crying as Allah's Messenger (ﷺ) has said, 'The dead person is tortured by the crying of his relatives.?" Ibn `Abbas said, "`Umar used to say so." Then he added narrating, "I accompanied `Umar on a journey from Mecca till we reached Al-Baida. There he saw some travelers in the shade of a Samura (A kind of forest tree). He said (to me), "Go and see who those travelers are." So I went and saw that one of them was Suhaib. I told this to `Umar who then asked me to call him. So I went back to Suhaib and said to him, "Depart and follow the chief of the faithful believers." Later, when `Umar was stabbed, Suhaib came in weeping and saying, "O my brother, O my friend!" (on this `Umar said to him, "O Suhaib! Are you weeping for me while the Prophet (ﷺ) said, "The dead person is punished by some of the weeping of his relatives?" Ibn `Abbas added, "When `Umar died I told all this to Aisha and she said, 'May Allah be merciful to `Umar. By Allah, Allah's Messenger (ﷺ) did not say that a believer is punished by the weeping of his relatives. But he said, Allah increases the punishment of a non-believer because of the weeping of his relatives." Aisha further added, "The Qur'an is sufficient for you (to clear up this point) as Allah has stated: 'No burdened soul will bear another's burden.' " (35.18). Ibn `Abbas then said, "Only Allah makes one laugh or cry." Ibn `Umar did not say anything after that.

Reference	: Sahih al-Bukhari 1286, 1287, 1288
In-book reference	: Book 23, Hadith 47
http://sunnah.com/bukhari/23/47

So, if a muslim rejects narrations that are wrongly attribute to Prophet - then he/ she is following the way of mother of believers - Hazrat Ayesha.